[mlir][CAPI] Export mlirValueEqual in C API

[byronyi]

Summary

Somehow it is not exported in C API.

[ftynse]

Need help landing this?

[byronyi]

In D105422#2861309, @ftynse wrote:

Need help landing this?

It would be very much appreciated :)

[ftynse]

Could you please give me a name and an email address to use on the commit?

If you use arcanist for future patches, this won't be necessary.

[byronyi]

Author: Bairen Yi <[e-mail]>

mlir/include/mlir-c/IR.h

 //===----------------------------------------------------------------------===//
 // Value API.
 //===----------------------------------------------------------------------===//
 
 /// Returns whether the value is null.
 static inline bool mlirValueIsNull(MlirValue value) { return !value.ptr; }
 
 /// Returns 1 if two values are equal, 0 otherwise.
-bool mlirValueEqual(MlirValue value1, MlirValue value2);
+MLIR_CAPI_EXPORTED bool mlirValueEqual(MlirValue value1, MlirValue value2);
 
 /// Returns 1 if the value is a block argument, 0 otherwise.
 MLIR_CAPI_EXPORTED bool mlirValueIsABlockArgument(MlirValue value);
 
 /// Returns 1 if the value is an operation result, 0 otherwise.
 MLIR_CAPI_EXPORTED bool mlirValueIsAOpResult(MlirValue value);
 
 /// Returns the block in which this value is defined as an argument. Asserts if